Expansible pulley



Aug. 19 1924.

J. OLSEN EXPANSIBLE PULLEY Filed Nov. 21 1922 Patented Aug. 19,1924. 1 I j 1 ED STATES PATENT o FIc i v nuts I. oLsoiI; on nonmnwo on, ome 151mm. I

EXrANsIsLE otany. application filed November 21,1922. Serial No. 602,396.

To all whom itmayconceom: spoke member being supported in relation Be it known that I, NELS I. OLsoN, a thereto byEa lip 12 formed integral with the citizen of the United States, residing at other spoke member 7. Northwood, in the county "of Grand Forks These sections: areassembled as is shown 5 and State of North .flDakotafhave invented to advantage in Figure 1 so that the body certain new and useful Improvements in of each section overlaps the section to the Expansible Pulleys, of which the following right thereof considering Figure 1 in a is a specification. clockwise direction. The bolts 13 have their The present invention relates to improveheads countersunk and extend through the ments in driving and other pulleys and the overlapped portions of the bodies 9 passing principal object of the invention is to prothrough the slots 10 in the bodies of vide a device of this nature which may be adjacent sections and securely held in place expanded and contracted so as to alter the by nuts. Vhen these nuts are loosened on diameter thereof whereby any slackness of the bolts 13 the bodies 9 may be slid in 15 the driving or driven pulley which may relation to each other by varying the angle 79 occur during use may be taken up. between the spoke members 7. The smaller Another object of the invention is to prothe angles between the spoke members 7 the vide a segmental rim capable of contraclarger will be the diameter of the rim. The tion and expansion by adjusting the sections ends of the bodies 9 are fastened to the in relation to each other, said sections being lips 12 of the adjacent sections by the bolts overlapped so that the perimeter or rim 14 which pass through one of the slots 10 will present a comparativel rough surface provided in the bodies. so as to prevent slipping o the bell frame It is thought that the invention will now the be understood without a more detailed de- With the above and numerous other obscription thereof but it is desired to point jects in View as will appear as the descripout that numerous changes in the details of tion progresses, the invention resides in cerconstruction and in the combination and artain novel features of construction, and in rangement of parts may be resorted to with the combination and arrangement of parts out departing from the spirit of the inven- 30 as will be hereinafter more fully described tion as hereinafter claimed. d l im d, Having thus described my invention what In the drawing I claim as new is Figure 1 is a side elevation of the pulley 1. An expansible pulley comprising a rim embodying my invention, and formed of a plurality of sections having 35 Figure 2 is an enlarged fragmentary secbodies adapted to slide over one another, tion therethrough. each section including a pair of connected Referring tothe drawing in detail it will spoke members converging toward the cenbe seen that a hub 1 is constructed with the ter of the pulley, said bodies attached to usual opening 2 for receiving a shaft or the one spoke member and curved to extend like and I preferably provide a set screw over the other spoke member and means for 3 so that the hub may be keyed to the shaft holding the bodies in adjusted relation in for rotation therewith. On the hub 1 I respect to one another. provide a series of apertured ears 1 arranged 2. An expansible pulley comprising a hub, in registering pairs so that a pin 5 may be a plurality of rim sections mounted on the supported by each pair. 'hub, each section including a pair of con- The rim of the pulley wheel is formed in nected spoke members of yielding material a plurality of sections each consisting of converging toward the hub so that the angle a pair of spoke members 7 which converge there-between may be varied, and a body toward the hub 1 and are connected by portion fixed to one spoke member and 50 means of a sleeve 8 which receives the reoverlapping the end of the other spoke memspective pin 5. The body 9 of each section oer, said spoke members being connected is of arcuate formation and provided with to said hub at their juncture with each other, slots 10 adjacent each spoke member 7 and means for holding the bodies in adjusted This body 9 is formed integral with one positions in respect to one another. 55 spoke member 7 and extends over the other 3. An expansible pulley comprising a hub,

a plurality of rim sections, each section including a sleeve, a pair of spoke members converging toward the sleeve and formed of yielding material so that the angles therebetween may be varied, and a body portion fixed to one spoke member and overlapping the end of the other spoke member, means for holding the bodies of the sections in adjusted positions in relation to each other, and means for pivotally mounting the sleeves on the hub.

4. An expansible pulley comprising a hub, a plurality of rim sections mounted on the hub, each section including a pair of in- 15 tegrally connected spoke members of yielding material converging toward the hub so that the angle therebetween may be varied, and a body portion fixed to one spoke member and overlapping the end of the other spoke member, said body portions being extended so as to overlap one of the next adjacent body portions and means for holding the body portions in adjusted positions in respect to one another.

In testimony whereof I afiix my signa- 2r,

ture in presence of two witnesses.

NELS I. OLSON. Witnesses:

J. L. GOESON, BLANDA PETERSON. 

